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As parent mentioned, python!=cpython. You've got pypy, cython, typed cython, nuitka, and probably some others I forgot about. Without knowing what you're trying to achieve and what you've tried, "extremely slow" is pretty hard to accept.

Cython is a subset of Python, while PyPy has shitty C interop if nothing changed from the last time that I checked. Ergo in a general sense Python = CPython. If you have specific needs you may want to consider the alternatives, but saying that Cython is Python is at least shady if not completely deceptive.

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